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4c218c96f6
from o.jsmack.tcp.sm, as XEP-198 Stream Management is not an "XMPP over TCP" exclusive feature. It could also be use together with the Websocket binding of XMPP, so we may have a smack-streammangement in the future. This change prepares for that by moving the SM code out of the XMPP TCP package namespace.
51 lines
1.8 KiB
Java
51 lines
1.8 KiB
Java
/**
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*
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* Copyright © 2014 Florian Schmaus
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jivesoftware.smack.sm;
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import java.math.BigInteger;
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public class SMUtils {
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private static long MASK_32_BIT = BigInteger.ONE.shiftLeft(32).subtract(BigInteger.ONE).longValue();
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/**
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* Quoting XEP-198 4.:
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* "In the unlikely case that the number of stanzas handled during a stream management session exceeds the number
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* of digits that can be represented by the unsignedInt datatype as specified in XML Schema Part 2 [10]
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* (i.e., 2^32), the value of 'h' SHALL be reset from 2^32-1 back to zero (rather than being incremented to 2^32)."
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*
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* @param height
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* @return the incremented height
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*/
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public static long incrementHeight(long height) {
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return ++height & MASK_32_BIT;
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}
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/**
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* Calculates the delta of the last known stanza handled count and the new
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* reported stanza handled count while considering that the new value may be
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* wrapped after 2^32-1.
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*
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* @param reportedHandledCount
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* @param lastKnownHandledCount
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* @return the delta
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*/
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public static long calculateDelta(long reportedHandledCount, long lastKnownHandledCount) {
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return (reportedHandledCount - lastKnownHandledCount) & MASK_32_BIT;
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}
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}
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